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-/**
- * @file llsimplestat.h
- * @brief Runtime statistics accumulation.
- *
- * $LicenseInfo:firstyear=2010&license=viewerlgpl$
- * Second Life Viewer Source Code
- * Copyright (C) 2010, Linden Research, Inc.
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation;
- * version 2.1 of the License only.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- *
- * Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
- * $/LicenseInfo$
- */
-
-#ifndef LL_SIMPLESTAT_H
-#define LL_SIMPLESTAT_H
-
-// History
-//
-// The original source for this code is the server repositories'
-// llcommon/llstat.h file. This particular code was added after the
-// viewer/server code schism but before the effort to convert common
-// code to libraries was complete. Rather than add to merge issues,
-// the needed code was cut'n'pasted into this new header as it isn't
-// too awful a burden. Post-modularization, we can look at removing
-// this redundancy.
-
-
-/**
- * @class LLSimpleStatCounter
- * @brief Just counts events.
- *
- * Really not needed but have a pattern in mind in the future.
- * Interface limits what can be done at that's just fine.
- *
- * *TODO: Update/transfer unit tests
- * Unit tests: indra/test/llcommon_llstat_tut.cpp
- */
-class LLSimpleStatCounter
-{
-public:
- inline LLSimpleStatCounter() { reset(); }
- // Default destructor and assignment operator are valid
-
- inline void reset() { mCount = 0; }
-
- inline void merge(const LLSimpleStatCounter & src)
- { mCount += src.mCount; }
-
- inline U32 operator++() { return ++mCount; }
-
- inline U32 getCount() const { return mCount; }
-
-protected:
- U32 mCount;
-};
-
-
-/**
- * @class LLSimpleStatMMM
- * @brief Templated collector of min, max and mean data for stats.
- *
- * Fed a stream of data samples, keeps a running account of the
- * min, max and mean seen since construction or the last reset()
- * call. A freshly-constructed or reset instance returns counts
- * and values of zero.
- *
- * Overflows and underflows (integer, inf or -inf) and NaN's
- * are the caller's problem. As is loss of precision when
- * the running sum's exponent (when parameterized by a floating
- * point of some type) differs from a given data sample's.
- *
- * Unit tests: indra/test/llcommon_llstat_tut.cpp
- */
-template <typename VALUE_T = F32>
-class LLSimpleStatMMM
-{
-public:
- typedef VALUE_T Value;
-
-public:
- LLSimpleStatMMM() { reset(); }
- // Default destructor and assignment operator are valid
-
- /**
- * Resets the object returning all counts and derived
- * values back to zero.
- */
- void reset()
- {
- mCount = 0;
- mMin = Value(0);
- mMax = Value(0);
- mTotal = Value(0);
- }
-
- void record(Value v)
- {
- if (mCount)
- {
- mMin = llmin(mMin, v);
- mMax = llmax(mMax, v);
- }
- else
- {
- mMin = v;
- mMax = v;
- }
- mTotal += v;
- ++mCount;
- }
-
- void merge(const LLSimpleStatMMM<VALUE_T> & src)
- {
- if (! mCount)
- {
- *this = src;
- }
- else if (src.mCount)
- {
- mMin = llmin(mMin, src.mMin);
- mMax = llmax(mMax, src.mMax);
- mCount += src.mCount;
- mTotal += src.mTotal;
- }
- }
-
- inline U32 getCount() const { return mCount; }
- inline Value getMin() const { return mMin; }
- inline Value getMax() const { return mMax; }
- inline Value getMean() const { return mCount ? mTotal / mCount : mTotal; }
-
-protected:
- U32 mCount;
- Value mMin;
- Value mMax;
- Value mTotal;
-};
-
-#endif // LL_SIMPLESTAT_H